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Will Allen, of Growing Power, grows kale and chard year round in his Milwaukee hoophouses heated with compost. Allen is listed on Time Magazine's annual "Time 100: The World's Most Influential People" list. (Benny Sieu/Milwaukee Journal Sentinel/MCT)
Will Allen, founder and chief executive officer of Milwaukee-based Growing Power, walks through one of the organization's greenhouses on Milwaukee's north side in this 2008 file photo. (AP Photo/Carrie Antlfinger)